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A070291
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a(n) = lcm(10,n)/gcd(10,n).
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3
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10, 5, 30, 10, 2, 15, 70, 20, 90, 1, 110, 30, 130, 35, 6, 40, 170, 45, 190, 2, 210, 55, 230, 60, 10, 65, 270, 70, 290, 3, 310, 80, 330, 85, 14, 90, 370, 95, 390, 4, 410, 105, 430, 110, 18, 115, 470, 120, 490, 5, 510, 130, 530, 135, 22, 140, 570, 145, 590, 6
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OFFSET
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1,1
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LINKS
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Index entries for linear recurrences with constant coefficients, signature (0,0,0,0,0,0,0,0,0,2,0,0,0,0,0,0,0,0,0,-1)
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FORMULA
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Sum_{k=1..n} a(k) ~ (101/40)*n^2. - Amiram Eldar, Oct 07 2023
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MATHEMATICA
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Table[LCM[10, n]/GCD[10, n], {n, 80}] (* Harvey P. Dale, Nov 01 2013 *)
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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STATUS
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approved
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